429 Too Many Requests

Hi, I’m looking for specific words or text in pdf’s and I cant seem to do this. A lot of sites on the net, refer to a magnifying glass icon on the top left or bottom left, both of which I cant find. I’m using a iPad with iOS 13.2.3 with the apple keyboard. I have tried using cmd + f without any luck. The pdf documents are not scanned so it should work if you try it on a computer. Any help with this?